/Engine/Source/Developer/AutomationDriver/Public/IDriverSequence.h
Queues a move of the cursor over the element, then triggers the series of events to invoke mouse input for releasing the specified button. The button will not be pressed if it is not currently being pressed.
[IActionSequence](API\Developer\AutomationDriver\IActionSequence) & Release ( const [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [IElementLocator](API\Developer\AutomationDriver\IElementLocator), ESPMode::ThreadSafe > & ElementLocator, [EMouseButtons::Type](API\Runtime\ApplicationCore\GenericPlatform\EMouseButtons__Type) MouseButton )